Your changes were actually really good. However, instead of running a 2nd Demented Frostcaller & Cabalist's Tome i chose to run a Volcanic Potion (MSoG) & leave a Wild Pyromancer to combo in case Giantfin dropped 1x/2x Coldlight Seer(s) on the same turn. Also, managed to somehow set a 2x Flamewaker turn which helped me seal the game really early with 2x Fireball(s) in hand.

First try thanks... Doomsayer turn 2 then play it like tempo mage with flamewaker, if you draw summoning stone get it down on 5 in preparation for blizzard or flamestrike bc passed 7 mana he will flood the board every turn. good luck

This is the ONLY deck I've ever gotten to work. Animated Armor on 4 is 100% win. After that, just keep flamstrike, blizzard, nova, and flamewaker clearing the board. Worst case scenario is eating 7 damage even with a warleader on the board.

Won on my first try with this deck. Def. needed the Animated Armor on turn 4 tho, the enemy will not attack it for some reason, so this helps mitigate damage.

One shot him with this one, didnt even have to try out the other decks. The only thing that got out of hand was his freaking Legendary murloc with full board, could' avoid damage from him but still it was dealt easily